Fujitsu FR81S User Manual
CHAPTER 5: CLOCK
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : CLOCK
FUJITSU SEMICONDUCTOR CONFIDENTIAL
53
5.1.2. Sub Clock (SBCLK)
The sub clock (SBCLK) is shown.
The oscillation of the sub clock stops on any of the following conditions.
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After the occurrence of reset (the bus idle wait time before stop is required. See "CHAPTER: RESET".)
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During the stop mode
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While a clock other than the sub clock (SBCLK) are selected as the source clock and "0" is set to
CSELR.SCEN bit.
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When the clock is used as a port because the clock is used for sub oscillation and port (metal option).
After all the above conditions of the oscillation stop are cancelled and then the oscillation stabilization wait
time which is set to CSTBR.SOSW[2:0] goes by, supplying the clock starts. The sub clock oscillation stops
until "1" is set to because CSELR.SCEN bit is initialized to "0" at the time of return from the reset input or the
INIT status.
MB91520 Series
MN705-00010-1v0-E
214